Variable Tg shape memory polyurethane for wellbore devices

摘要: Wellbore devices for use in filtration, wellbore isolation, production control, lifecycle management and construction may include at least a first second shape-memory material each having an altered geometric position original position. Each shape- memory polyurethane held the run-in temperature below glass transition (Tg), where Tgs and/or respective slope changes of materials are different. Once device is place downhole subjected to temperatures above their Tgs, will deploy expand recovered positions or near perform control other function. These deployments expansions occur different times rates.